![]() The instant torque from the electric motor yields remarkable off-the-line quickness, and once the V8 kicks in, the XM races rapidly to a redline of 7,000 RPM. ![]() I can't think of any PHEV powertrain that works so perfectly in unison. The XM's 29.5-kilowatt-hour gross (25.7-kWh usable) lithium-ion battery pack and electric motor help fill in the gaps where turbo lag might live – not that this rowdy V8 has much of it – and the transition between gas and electric is seamless. While that isn't as quick as the Aston Martin DBX 707, Lamborghini Urus, or even the Bentley Bentayga Speed, the 750-hp Red Label model will eventually bring the XM closer to that bunch. That helps launch this behemoth of an SUV to 60 miles per hour in 4.1 seconds. Powered by a twin-turbocharged 4.4-liter V8 and a single electric motor wedged between the engine and transmission, the XM has 664 horsepower and 590 pound-feet of torque.
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